Immunophenotyping schizophrenia subtypes stratified by antipsychotic response

Area of Science:

• Neuroimmunology
• Psychiatry
• Immunology

Background:

• Immune dysfunction is implicated in psychosis pathophysiology.
• Existing immunophenotyping studies for schizophrenia are limited by small sample sizes and marker scope.
• Few studies have explored immunophenotypes in treatment-resistant schizophrenia.

Purpose of the Study:

• To conduct comprehensive immunophenotyping in schizophrenia patients with varying antipsychotic responses.
• To identify immune cell populations associated with schizophrenia and increasing treatment resistance.
• To explore potential immune modulators of psychosis and treatment response.

Main Methods:

• Comprehensive immunophenotyping of 196 subjects (147 schizophrenia patients, 49 healthy controls) using flow cytometry.
• Stratification of schizophrenia patients into antipsychotic-responsive, clozapine-responsive, and clozapine-resistant groups.
• Analysis of 66 immune cell populations and comparison between groups.

Main Results:

• Downregulation of mucosal-associated invariant T (MAIT) cells, CD8+ T cells, plasmablasts, IgG+ B cells, and cDC2 in schizophrenia, with increased downregulation in treatment resistance.
• Upregulation of naive and exhausted CD4+ T cells, CD4/CD8 ratio, and myeloid cells in schizophrenia, with increased upregulation in treatment resistance.
• Significant immunophenotypic differences observed between schizophrenia cases and controls, and across treatment resistance levels.

Conclusions:

• Significant immunophenotypic differences exist between schizophrenia patients and healthy controls.
• Trends in immune cell alterations correlate with increasing antipsychotic resistance.
• Identified immune cell populations may serve as biomarkers for treatment resistance in schizophrenia.